If you are looking at a die cutting machine for personal use they are all terrifically expensive and compared to hand cutting fabric, they are wasteful. But and it's a big but, and it's the reason I bought a Studio is there are certain classic shapes that are a pain to cut and therefore I stay away from using patterns associated with them. Having a die cut system that will accurately do this for me lets me enjoy the quilting process. The studio vs. the go, has more of the classic pieces available and it is possible to get custom dies made if there is one you don't find. I settled on the studio because I could get a finished 1/2 hex which was the size I needed for a design I'm working on. I'm unlikely to purchase their die sets, because I really don't make the same quilt over and over, but I did add a strip cutter for the binding size I mostly use. The Go is great if you want the applique dies or whatever is popular at the moment, or if you are just cutting one or two squares from many individual fabrics.
Just my two cents. Diana